[PATCH 8/9] xfrm: Verify MAC header exists before overwriting eth_hdr(skb)->h_proto

[Steffen Klassert]

From: Yossi Kuperman <yoss...@mellanox.com>

Artem Savkov reported that commit 5efec5c655dd leads to a packet loss under
IPSec configuration. It appears that his setup consists of a TUN device,
which does not have a MAC header.

Make sure MAC header exists.

Note: TUN device sets a MAC header pointer, although it does not have one.

Fixes: 5efec5c655dd ("xfrm: Fix eth_hdr(skb)->h_proto to reflect inner IP 
version")
Reported-by: Artem Savkov <artem.sav...@gmail.com>
Tested-by: Artem Savkov <artem.sav...@gmail.com>
Signed-off-by: Yossi Kuperman <yoss...@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 net/ipv4/xfrm4_mode_tunnel.c | 3 ++-
 net/ipv6/xfrm6_mode_tunnel.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index 63faeee989a9..2a9764bd1719 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -92,7 +92,8 @@ static int xfrm4_mode_tunnel_input(struct xfrm_state *x, 
struct sk_buff *skb)
 
        skb_reset_network_header(skb);
        skb_mac_header_rebuild(skb);
-       eth_hdr(skb)->h_proto = skb->protocol;
+       if (skb->mac_len)
+               eth_hdr(skb)->h_proto = skb->protocol;
 
        err = 0;
 
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index bb935a3b7fea..de1b0b8c53b0 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -92,7 +92,8 @@ static int xfrm6_mode_tunnel_input(struct xfrm_state *x, 
struct sk_buff *skb)
 
        skb_reset_network_header(skb);
        skb_mac_header_rebuild(skb);
-       eth_hdr(skb)->h_proto = skb->protocol;
+       if (skb->mac_len)
+               eth_hdr(skb)->h_proto = skb->protocol;
 
        err = 0;
 
-- 
2.14.1